Choosing the Right St. Augustine for South Texas Clay: Soil Testing, Variety Traits, and Why Bermuda Might Be Better

Your Rio Grande Valley lawn has heavy black clay. Raleigh St. Augustine yellowed; you're told to switch to Floratam. But the real answer starts with a soil test.

Soil Test First

Texas A&M (soiltesting.tamu.edu) or your county extension office will reveal pH, nutrients, and texture—guiding every decision.

Variety Comparison

• Raleigh: Good cold tolerance, likes heavy clay, hates summer heat.
• Floratam: Shade and drought tolerant, cold sensitive (not an issue in Zone 9).
• Bermudagrass: The choice of South Texas golf courses—thrives in heat, sun, and clay with proper management.

Clay Is an Asset

Clay holds nutrients. Amend with organic matter (compost, manure) to improve structure. Don't add sand—it creates concrete.

Test your soil. If you have full sun and want low maintenance, Bermuda beats both St. Augustine varieties.